Why are train tracks always laid on a bed of stones, while high-speed rail tracks are kept so clean

Why is 194 dB the sound limit, and what happens if you exceed 194 dB?

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Technology changes life.

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A man's speed bump

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Children's educational handmade building blocks track toy rainbow pipe ball game

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Children's educational handmade toys building blocks roller coaster big shark ball game

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Infinitely looping track...

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The more skills you have, the better.

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Children's educational handmade toys building blocks track roller coaster ball ice tyrannosaurus gam

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I pushed it and found out that the road is so wide

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Quick Tips for Hardware Tools

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The magic of 9v battery

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Children's educational handmade toys colorful track ball game

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The Production Process of Cement Circular Pipes

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My daily maintenance work on high-speed trains | Railway employees made their own short film based o

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Children's classic marble toys, rainbow plastic pipe wooden track assembly game, super decompression

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The Master of Man-Speed Bumps

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Interesting building block rotating track marble assembly toy! There is also an automatic spinning p

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0.1 second winning race! Intense 4WD race for third place! Even the 4WD brothers wouldn't dare to ac

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Carrera track racing

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The follow-up on well drilling at the mountaintop is here

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